Question

What is the formula for the total eddy current loss in conductors?

(a) total copper loss = 3 * average value of the eddy current constant * current per phase^2 * dc resistance

(b) total copper loss = 3 / average value of the eddy current constant * current per phase^2 * dc resistance

(c) total copper loss = 3 * average value of the eddy current constant / current per phase^2 * dc resistance

(d) total copper loss = 3 * average value of the eddy current constant * current per phase^2 / dc resistance

I had been asked this question in semester exam.

This question is from Losses and Temperature Rise in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct option is (a) total copper loss = 3 * average value of the eddy current constant * current per phase^2 * dc resistance

To elaborate: The average value of the eddy current constant is obtained. Next the I^2R loss values are calculated and multiplying with 3 gives the total copper loss.